Sand-blast apparatus.



G. R. LAWRENCE.

SAND BLAST APPARATUS. Y

APPLIOTION FILED JAN. 17, 1912.

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clear, and exact description, reference being had to the accompanyingdrawings.

. varying conditions of use.

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spcification t Letters-retenu Patentedsept. 16, 19913appuuationmeaznnuarji'a 1912. -`Ser1a1'1ro.c 71,7ee. .y Y 4 To all whomit may concern.'

Cleveland in'the county of Cuyahoga and State of hio, have'invented acertain new and useful Improvement in Sand-Blast Apparatus, of w ich thefollowing is a full,

This invention relates to sand blast apparatus, and has for its generalobjects to provide an apparatus of this 'character that will giveasteady flow or discharge of sand; that will be capable of effectively'regulating the How of air and sandthrough the dise charge nozzle;thatwill be extremely con-I venient in operation and relatively simpleand inexpensive of production;

.A further object of the invention is to provide an improved form andconstruction of nozzle and improved means whereby the flow of sand may'be regulated in accordance with the grade of'sand used and other Withthe foregoing objects in view, the invention may be defined further asconsistn ing ofthe combinations of elements em'- bodied in theclaims-hereto annexed and illustrated in the. drawings forming a parthereof, wherein-'- y Figure '1 represents a sectional view of the hopperand portions of the sand and air conduits of my apparatus, Fig. 2.-asectional detail corresponding to the line 2-2 of Fig. 1, looking in thedirection of the arrows, Fig. S-detail viewpartly in section and partly.in elevation, of the' discharge e ds of the sand and air ducts,including tiie nozzle. Fig. 4-a sectionaldetail correspondln looking 1n4.the direction of the arrows.

Describing by reference characters the` various parts illustratedherein, 1 denotes the hopper or sand receptacle, the same being ofgeneral frusto pyramidal shape and having at its lower end an 'extension2, generally rectangular in section, provided with a round, closedbottom 3.

4 denotes a pipe section comprising part of the sand conduit, saidsection extending across the bottom extension 2. and prefer-I ably'parallel -with and a short distance above the rounded 'bottom 3. -Thispipe sec tion is provided with a thread' 5 having a pair of clampingnuts 6 thereomby means tothe line 4--4 of Fig. 3 and of which it issecured to the inner and outer surfaces of one of the end walls of thebottoni extension 2. The pipe section 4 is provided with e ort 7, whichmay be conveniently formed y cutting out a semi-cylindrr cal port-10h ofsaid pipe section and so assemblmgthe parts that the port wil-l bedirected downward, as shown-in Figs. l and 2. The port 'willA'preferably be located above the central portion of the bottom 'ex-Atensmn.` The end of the pipe sect-ion'4, oppositelthe nuts6,*extendsthrough the other end wall ofthe'b'ottom-extension 2 aconsiderable dist-ance and is provided with an internal thread for thereception ofthe- 'reduced threaded end' 8 of a plug 9. The enlarged endof this plug is oi greater diameter than the pipe section 4 and isprovided withan external thread for the reception of an internal threadprovided inthe outer end of 'a sleeve 10. This sleeve projects throughan aperture in the wallof the bot- 'tomextension Aopposite the nuts 6,the sleeve being mounted in a stuffing box 11 which rejects from thecooperating wall of the ot-tcm extension. An operatmg handle 12 issecured to the sleeve ina suitable manner for the' purpose of adjustingthe sleeve along the pipe section 4, so as to control ther effect-ivearea ofthe port 7-. The plug 9 is provided with a bore 13, and this boreis placed in communication with a 'vacuum gage 14 by means of apipe 15threadedl into the outer end 'of the plug- The pipe section 4 is shownas threaded into an elbow" 16, from which there extends secondpipesection 17 having an external thread 18 thereon. Secured to the endof the pip'e sectionl 17 is a hose or similar flexible pipe 19. Thisflexible' pipe may be of any desired length, according to the conditionsof use. At its lower oi' discharge end it is connected to a. suitablemetallic nozzle secs tions, 4, 17 and 19-.exteiids for the greater loslas

part o f its length through the air supply conduit, the followingconstruction bem employed for this purpose. 24 denotes a. having aconnection 25 into which the air 5 supply pipe 26 is threaded, said pipebeing provided with a valve 27. One end of the T is closed by means of aplug 28, which is threaded into said Ty and has a threaded bore by meansof which it and the T are connected with the pipe section 17. In the endo'f the T opposite the plug threaded a bushing 29, and to this bushingthere is secured the hose or similar flexible pipe 30 which surroundsthe pipe 19 and forms therewith an annular passageway for the airdischarged into the v'" In the lower or discharge end of the pipe 30there is mounteda nozzle section 31, thel parts being `so arranged thatsaid Section shall surround the nozzle section 20, the latter sectionbeing mounted and centered within the section 31 by having the portion23 thereof threaded into the bore of a spider 32 carried by the innerend of the nozzle section 31 and preferably formed therewith. Theforward or discharge end of the nozzle section 31 is provided with aninwardly'directed flange having an `internally threaded at its inner endwith an Voutwardly tapering seat 34, merging with a shoulder 35, whichshoulder forms an abutment for a bushing 36, which may be slipped ordriven into the bore of the section 33, the parts being so proportionedthat when the bushing is so inserted its bore will form in effect acontinuation of the enlarged end of the seat 34. The bushing may beconveniently retained in place by means of a set screw 37 and is made ofspecially hardened steel tol enable it to withstand the action of thesand.

With the parts constructed and arranged las described, the operationwill be as followsrrThe sleeve 10 will be adjusted vby the handle 12 toregulate the eiective size of the port 7 in connection with the grade ofsand used. As is well known, the finer the sand the less air will berequired to feed it to the point of use. Air will be turned into itsconduit by operating the valve 27 and will i'low around the sandconduit, through the ports 38 in the spider 32, around the nozzlesection 20 and through the section `33, thereby creating a suction uponthe former nozzle section, which section will draw the sand from thehopper through its conduit. It will be observed that ample clearance isprovided between the sand and air conduits to accommodate the fullcapacity of the pipe 26. The ports 38 will also be of suiicient area notto ymateriallyv reduce or interfere with the flow of air-to a5 thenozzle section 33. By .this arrangement,

.will be no eed of sand by gravity from the 28 there is.

bore for the reception of a nozzle section 33, the last mentionedsection being provided there will be practically nofrctional resistanceto the flow of air through its conduit to the entrance of the dischargenozzle sec. tion 33. By adjusting the nozzle section 33 toward and fromthe section 20 the iow of air, and consequently the iow of sand, may

be ad'usted simultaneously in accordance with t e conditions of use.

In the` a paratus d1sclose`d herein, there hopper, since the sandisobliged to move laterally through the hopper intol the conduit section4 and sincesuch movement cannot occur through the gravity of sand,

the sand not being suiiiciently iiuid to per-4 80 mit this movement. Thegage 14 indicates to the operator the amountof. vacuum that g j is being'produced in the sand conduit and' hopper. Any sudden diminution in thisvacuum indicates leakage in the air or sand conduit or the necessity forfilling the hopper.- Should it be necessary to cut oil the blast, thiscan be accomplished by bringing the valve seat 34 in contact with thetapered end of the nozzle section 2() which results in cutting oi theflow of air and thus the low of sand.

Having thus described my invention, what` I claim is:

1. In a sand' blast apparatus, the combination of a receptacle, aconduit for sand having a pipe' section. extending into said receptacleabove thebottom and provided with a downwardly directed port, a sleevesurrounding the said pipe4 section and ad- 100 justable thereon to varythe effective area of said port, a. iuid pressure supply conduitsurrounding the discharge end of the sand conduit, and means forregulating the low of air"through the latter conduit'.

2. In a sand blast apparatus, the combination of a sand receptacle,asand conduit comprising a pipe section extending through the oppositewalls of said receptacle above the bottom thereof and provided with aport 110 in its lower surface, a sleeve adjustably mounted on the end ofsaid pipel section and projecting into the receptac e and arranged tocontrol the effective area of said port, a

vfluid pressure supply conduit arranged to discharge past the dischargeend of the for` mer conduit to create a suction therein, and means forcontrolling the iiow of the iuid through its conduit.

v3. In a sand last apparatus, the combi- 12o nation of a receptacle, apipe section extending across t-he receptacle and having 'a port in itslowerl surface above the bottom of such receptacle, a plug for the endof said section, asleeve adjustably mounted on said plug and surroundingsaid c'onduit sectionl and adapted to overlap the port thereof, a nozzlesection with which the sand conduit communicates, and a uid pressuresupply pipe communicating with 130 connecting Atherewith and comprisinga"- leXible pipe having at its discharge end a nozzle section providedwith an annular seat surrounding its mouth, a pressure fluid conduithaving a nozzle' section surrounding the former nozzle section andprovided with an interiorly cylindrical elongated discharge passagewaycommon to both conduits, said last mentioned section being substantiallycoaxial with said first mentioned nozzle section and 'being adjustablymounted with respect thereto, the diameterof said discharge passagewaybeing not materially less than that of said first nozzle section andsaid second nozzle section having a seat g surrounding said passagewayand adapted to coperate with said rst seating portion whereby the flowof pressure luid may be regulated.

5. In a sand blast apparatus, t-he combination of a fluid pressuresupplyconduit having at its discharge end a sleeve providedwith an aperturedspider, said sleeve having an internally threaded bore, a dischargenozzle section threaded into said bore and having at its inner end avalve seat, and a sand conduit having a nozzle 'section threaded intosaid spider and having a valve coperating with said seat.

6. In a sand blast apparatus, the combination of a Huid pressure supplyconduit having at its discharge end a sleeve provided with an internalspider and with an inwardly directed flange spaced from said spider,said flange and spider each being provided with a threaded bore, adischarge nozzle section threaded into a bore of said flange, a sandnozzle adjustably threaded in Asaid spider, a sand conduit secured `tosaid nozzle, and a removable liner secured insaid discharge nozzlesection.

7. In a sand blast apparatus, the combination of a discharge nozzlecomprising sleevehaving threaded into its outer end a nozzle sect-ion,said nozzle section having at its inner or receiving end a beveled seathaving a shoulder at the outer and smaller end of said seat, a bushingremovably fitted in saidnozzle section and adapted to abut against saidshoulder, and a sand conduit having a nozzle section coperating with theseat on the iirst-mentionedlsection.

8. In a sand blast apparatus, the combination, with a conduit for sandand a nozzle carried by said conduit, of a second nozzle surroundingsaid first nozzle and spaced therefrom to define an annular` passageway,a pressure Huid conduit connected to said second nozzle andcommunicating with said annular passageway, a hollow cylindricalvdischarge section carried by said second nozzle forward of and inalinement with said first nozzle and a cylindrical hardened steelbushing removably secured within said discharge section.

In testimony whereof, I hereunto aiiix my signature in the presence oftwo witnesses.

GEORGE R. LAWRENCE.

J. B. IIULL, BRENNAN B. Wns'r.

